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81-587: The area of present-day Akita was part of ancient Dewa Province , and has been inhabited for thousands of years. The Jizōden ruins within the city limits are a major archaeological site with artifacts from the Japanese Paleolithic period through the Jōmon and Yayoi periods . During the Nara period , the imperial court established Akita Castle in 733 AD to bring the local Emishi tribes under its control. The area

162-649: A climatic transition zone humid subtropical climate ( Köppen Cfa ) and is the most populous city having absolute northern extremity of this climate zone within Japan, bordering very closely with the humid continental climate ( Köppen Dfa ) zone, comparable to New York City , USA. Akita is characterized with cold, very snowy, winters, and hot, humid summers. Monthly averages range from 0.4 °C (32.7 °F) in January to 25.0 °C (77.0 °F) in August. Due to its location near

243-467: A few plateaus. In addition, an underwater ridge rising up to 3,500 m (11,500 ft) runs from north to south through the middle of the central part. The Japanese coastal area of the sea consists of Okujiri Ridge, Sado Ridge, Hakusan Banks, Wakasa Ridge and Oki Ridge. Yamato Ridge is of continental origin and is composed of granite , rhyolite , andesite and basalt . It has an uneven bottom covered with boulders of volcanic rock. Most other areas of

324-498: A force of over 5000 men. The road was greatly resented by the Emishi tribes, and after an uprising in 767, pacification expeditions were carried out in 776, 778, 794, 801 and 811. During the Nara period , under the Engishiki classification system, Dewa was ranked as a "greater country" (上国). Under the ritsuryō system, Dewa was classed as a "far country" (遠国). The name of the province

405-720: A fort on the Mogami River . In 708 AD Dewa District ( 出羽郡 , Dewa-gun ) was created within Echigō Province. The area of Dewa District was roughly that of the modern Shōnai area of Yamagata Prefecture, and was gradually extended to the north as the Japanese pushed back the indigenous people of northern Honshū . Dewa District was promoted to the status of a province ( Dewa Province ( 出羽国 , Dewa no kuni ) ) in 712 AD, and gained Okitama and Mogami Districts, formerly part of Mutsu Province. A number of military expeditions were sent to

486-530: A mountainous character. In contrast, numerous large rivers flow from Honshū and Hokkaidō into the sea, including Japan's four largest rivers: the Shinano , Ishikari , Agano and Mogami . The total annual river discharge into the sea is 210 km (50 cu mi) and is relatively constant through the year, except for a minor increase in July. Most water (97% or 52,200 km  [12,500 cu mi]) flows into

567-632: A speed of 10–25 cm/s (4–10 in/s) in the open sea. They accelerate in the Korea Strait (40–60 cm/s or 16–24 in/s), La Pérouse Strait (50–100 cm/s or 20–40 in/s) and especially in the Tsugaru Strait (100–200 cm/s or 40–80 in/s). The amplitude of the tides is relatively low and varies strongly across the sea. It reaches 3 meters in the south near the Korea Strait, but quickly drops northwards to 1.5 m (5 ft) at

648-522: A wide southern part narrowing toward the north. The coastal length is about 7,600 km (4,700 mi) with the largest part (3,240 km or 2,010 mi) belonging to Russia. The sea extends from north to south for more than 2,255 km (1,401 mi) and has a maximum width of about 1,070 km (660 mi). It has three major basins : the Yamato Basin in the south-east, the Japan Basin in

729-479: Is August, with an average air temperature of 15 °C (59 °F) in the north and 25 °C (77 °F) in the south. Annual precipitation increases from 310–500 mm (12–20 in) in the north-west to 1,500–2,000 mm (59–79 in) in the south-east. A peculiar turbulent cloud pattern, named von Kármán vortices , is sometimes observed over the Sea of Japan. It requires a stable field of low clouds driven by

810-416: Is about 0 °C (32 °F) in the west and 5–6 °C (41–43 °F) in the east. This east-west difference drops to 1–2 °C (1.8–3.6 °F) in summer, and the temperatures rise to 18–20 °C (64–68 °F) in the north and 25–27 °C (77–81 °F) in the south. Because the sea is enclosed, its waters form clearly separated layers which may show seasonal and spatial dependence. In winter,

891-615: Is called Nihon kai ( 日本海 , literally 'Japan Sea') in Japan, Rìběn hǎi ( 日本海 , 'Japan Sea') or originally Jīng hǎi ( 鲸海 , 'Whale Sea') in China, Yaponskoye more ( Японское море , 'Japanese Sea') in Russia, Chosŏn Tonghae ( 조선동해 , literally 'Korean East Sea') in North Korea , and Donghae ( 동해 , literally 'East Sea') in South Korea . The use of the term "Sea of Japan" as

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972-465: Is especially noticeable between October and March when the strong (12–15 m/s [39–49 ft/s] or higher) north-western monsoon wind brings cold and dry continental air. The evaporation is blown further south, causing snowfall in the mountainous western coasts of Japan. This winter monsoon brings typhoons and storms, with the waves reaching 8–10 m (26–33 ft) which erode the western coasts of Japan. Tsunami waves have also been recorded in

1053-531: Is held inside a shrine made from walls of snow. A rice bale is set afire at the end of this festival. Each neighbourhood in Tsuchizaki Minato contributes a float decorated with giant figures from 20 to 21 July. In 1997 it was designated an Important Intangible Folk Cultural Property . Dewa Province Dewa Province ( 出羽国 , Dewa no kuni ) was a province of Japan comprising modern-day Yamagata Prefecture and Akita Prefecture , except for

1134-449: Is relatively constant. The surface layer tends to be more fresh in the sea parts which experience ice melting and rains. The average water density is 1.0270 g/cm in the north and 1.0255 g/cm in the south in winter. It lowers in summer to 1.0253 and 1.0215 g/cm , respectively. Few rivers flow into the Sea of Japan from mainland Asia , the largest being Tumen , Rudnaya, Samarga, Partizanskaya and Tumnin; all of them have

1215-752: Is the marginal sea between the Japanese archipelago , Sakhalin , the Korean Peninsula , and the mainland of the Russian Far East . The Japanese archipelago separates the sea from the Pacific Ocean . Like the Mediterranean Sea , it has almost no tides due to its nearly complete enclosure from the Pacific Ocean. This isolation also affects faunal diversity and salinity , both of which are lower than in

1296-472: Is the dominant economic activity in the region. The intensity of shipments across the sea has been moderate owing to political issues, but it is steadily increasing as a result of the growth of East Asian economies. Sea of Japan is the dominant term used in English for the sea, and the name in most European languages is equivalent, but it is sometimes called by different names in surrounding countries. The sea

1377-502: Is the lowest at 33.8‰ in the south-east and south-west because of frequent rains, and remains at about 34.09‰ in most other parts. Thawing of ice in spring reduces water salinity in the north, but it remains high at 34.60–34.70‰ in the south, partly because of the inflow of salty water through the Korea Strait . A typical variation of salinity across the sea in summer is 31.5‰ to 34.5‰ from north to south. The depth distribution of salinity

1458-718: The Asian mainland and Sakhalin; La Pérouse Strait between Sakhalin and Hokkaidō; the Tsugaru Strait between Hokkaidō and Honshū; the Kanmon Straits between Honshū and Kyūshū; and the Korea Strait between the Korean Peninsula and Kyūshū. The Korea Strait is composed of the Western Channel and the Tsushima Strait , on either side of Tsushima Island . The straits were formed in recent geologic periods. The oldest of them are

1539-714: The Japanese archipelago separated from each other. During the Miocene, the Sea of Japan expanded. The north part of the Japanese archipelago was further fragmented later until orogenesis of the north-eastern Japanese archipelago began in the later Late Miocene . The south part of the Japanese archipelago remained as a relatively large landmass. The land area had expanded northward in the Late Miocene. The orogenesis of high mountain ranges in north-eastern Japan started in Late Miocene and lasted in Pliocene also. The eastern margin of

1620-649: The Kamakura period , which developed into the centers of numerous rival samurai clans. In 1335, Shiba Kaneyori received the Dewa Province as a fief from Ashikaga Takauji , but ruled it only in name. By the end of the Sengoku period , the Mogami clan had emerged as the strongest local force in the southern portion of the province, whereas the Akita clan dominated the northern portion of

1701-635: The Kuril Islands . It is also reflected in various legends, such as the legend of the Heishi rock , which says that once when herring vanished, an old fairy threw a bottle with magic water into the sea, and the herring returned. The bottle got stuck to the seabed and turned into a rock, which became a representation of the God of the Sea of Japan. Vladivostok is a base for the Russian whaling fleet. Although it operates in

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1782-519: The Sea of Japan coast, it receives heavy snowfall, with just above 377 centimetres (148 in) per season, with accumulation occurring mostly from December to March. Precipitation is well-distributed and significant throughout the year, but is greater in the latter half. Over two thirds of all days see some precipitation, either rain or snow. Akita has a directly elected mayor and a unicameral city assembly with 39 members. The city contributes 12 members to

1863-604: The 1920s. American , Canadian and French whaleships cruised for whales in the sea between 1847 and 1892. Most entered the sea via Korea Strait and left via La Pérouse Strait , but some entered and exited via Tsugaru Strait . They primarily targeted right whales , but began catching humpbacks as right whale catches declined. They also made attempts to catch blue and fin whales , but these species invariably sank after being killed. Right whales were caught from March to September, with peak catches in May and June. During

1944-622: The 2001 World Games . Our Lady of Akita is the title of Marian apparitions reported in 1973 by Sister Agnes Katsuko Sasagawa in Yuzawadai, Soegawa, Akita City. The apparitions were approved by the Holy See in 1988. The 1988 approval was issued by Cardinal Joseph Ratzinger, who later became Pope Benedict XVI . In the Narayama Otamachi district of central Akita each February 12–15 a Shinto festival honoring both Suijin and Kamakura Daimyojin

2025-537: The Akita Prefectural Assembly. In terms of national politics, the city is part of Akita District 1 of the lower house of the Diet of Japan . The economy of Akita remains heavily dependent on agriculture (particularly rice cultivation), forestry and mineral extraction. Akita contains one of the most important oil fields in Japan. Oil refining , woodworking, metalworking, and the production of silk textiles are

2106-632: The Heian period, the province was organized into eleven districts. It was later a battleground in the Gosannen War and the Former Nine Years War . Following the destruction of the Northern Fujiwara clan by the forces of the Kamakura shogunate in 1189, many Fujiwara partisans fled to the mountains of Dewa and continued to resist central authority. The area was divided into numerous shōen during

2187-661: The Japanese islands. The largest bays are Peter the Great Gulf , Sovetskaya Gavan ; Vladimira Bay, Olga ; Posyet Bay in Russia; East Korea Bay in North Korea; and Ishikari (Hokkaidō), Toyama (Honshū), and Wakasa (Honshū) Bays in Japan. Prominent capes include Lazareva, Peschanyi (sandy), Povorotny , Gromova, Pogibi , Tyk, and Korsakova in Russia; Crillon on Sakhalin ; Sōya , Nosappu , Tappi , Nyuda, Rebun , Rishiri , Okushiri , Daso and Oki in Japan; and Musu Dan in North Korea. As world sea level dropped during

2268-544: The Japanese islands. In the 1780s, the Frenchman Jean-François de Galaup, comte de Lapérouse , traveled northward across the sea through the strait later named after him . In 1796, a British naval officer, William Robert Broughton , explored the Strait of Tartary, the eastern coast of the Russian Far East and the Korean Peninsula . In 1803–1806, the Russian navigator Adam Johann von Krusenstern while sailing across

2349-540: The Korean Peninsula, but they also mainly target countries not bordering the Sea of Japan. The major Russian port of Vladivostok mainly serves inland cargos, whereas Nakhodka and Vostochny are more international and have a busy exchange with Japan and South Korea . Other prominent Russian ports are Sovetskaya Gavan , Alexandrovsk-Sakhalinsky and Kholmsk , and the major ports of North Korea are Wonsan , Hamhung and Chongjin . The intensity of shipments across

2430-520: The Tsugaru and Tsushima straits. Their formation had interrupted the migration of elephants into the Japanese islands at the end of the Neogene Period (about 2.6 million years ago). The most recent is La Perouse Strait, which formed about 60,000 to 11,000 years ago closing the path used by mammoths which had earlier moved to northern Hokkaidō. All the straits are rather shallow, with a minimal depth of

2511-460: The area, with armed colonists forming settlements with wooden palisades across central Dewa in what is now the Shōnai area of Yamagata Prefecture . The capital of the new province was initially established at Dewanosaku (出羽柵), a fortified settlement in what is now part of Sakata, Yamagata , which served as a vital military stronghold in the expansion of Yamato control and settlement in the region. In 733,

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2592-403: The atmosphere in the northern part of the sea and by the currents in the southern part. Winter temperatures are 0 °C (32 °F) or below in the north and 10–14 °C (50–57 °F) in the south. In this season, there is a significant temperature difference between the western and eastern parts owing to the circular currents. So at the latitude of Peter the Great Gulf, the water temperature

2673-476: The basin in Chinese was "Sea of Whales" ), and the crustaceans by shrimps and crabs. Because of the shallow straits connecting the sea with Pacific Ocean, the Sea of Japan has no characteristic oceanic deep-water fauna. Flora and fauna unique to the region near the Sea of Japan are known as "Japan Sea elements". Fishery had long been the main economic activity on the Sea of Japan. It is mainly carried out on and near

2754-564: The bays as early as October and its remains may be seen even in June. Ice cover is continuous only in the bays and forms floating patches in the open sea. Ice melting in spring results in cold currents in the northern areas. In summer the wind weakens to 2–7 m/s (6.6–23.0 ft/s) and reverses its direction, blowing warm and humid air from the North Pacific onto the Asian mainland. The warmest month

2835-609: The capital was moved north, and a new military settlement, later named " Akita Castle ", was built what is now in the Takashimizu area of the city of Akita. Abe no Yakamaro was sent as Chinjufu-shōgun . In 737, a major military operation began to connect Akita Castle with Taga Castle on the Pacific Coast. Over the next 50 years, additional fortifications were erected at Okachi in Dewa Province and Monofu in Mutsu Province involving

2916-464: The city of Kazuno and the town of Kosaka . Dewa bordered on Mutsu and Echigō Provinces. Its abbreviated form name was Ushū ( 羽州 ) . Prior to the Asuka period , Dewa was inhabited by Ainu or Emishi tribes, and was effectively outside of the control of the imperial dynasty . Abe no Hirafu conquered the native Emishi tribes at what are now the cities of Akita and Noshiro in 658 and established

2997-462: The continental shelves and focuses on herring, sardines and bluefin tuna. These species are however depleted from after World War II . Squid is mostly caught near the sea center and salmon near the northern and south-western shores. There is also a well-developed seaweed production. The importance of the fishery in the sea is illustrated by the territorial disputes between Japan and South Korea over Liancourt Rocks and between Japan and Russia over

3078-489: The cyclonal character of the sea currents. Other notable expeditions of the 19th century include the American North Pacific Exploring and Surveying Expedition (1853–1856) and British Challenger expedition (1872–1876). The aquatic life was described by V. K. Brazhnikov in 1899–1902 and P. Yu. Schmidt in 1903–1904. The Japanese scientific studies of the sea began only in 1915 and became systematic since

3159-493: The deeper regions. There are no large islands in the sea. Most of the smaller ones are near the eastern coast, except for Ulleungdo (South Korea). The most significant islands are Moneron , Rebun , Rishiri , Okushiri , Ōshima , Sado , Okinoshima , Ulleungdo , Askold, Russky and Putyatin. The shorelines are relatively straight and lack large bays and capes; the coastal shapes are simplest in Sakhalin and are more winding in

3240-695: The domains in the area joined the Ōuetsu Reppan Dōmei supporting the Tokugawa shogunate. Following the defeat of the pro-Tokugawa forces, the new Meiji government reorganized Dewa province into Ugo Province ( 羽後国 ) in the north, and Uzen Province ( 羽前国 ) in the south in 1868.These provinces became Akita Prefecture and Yamagata Prefecture on August 2, 1876. [REDACTED] Media related to Dewa Province at Wikimedia Commons 39°00′59″N 140°19′02″E  /  39.01639°N 140.31722°E  / 39.01639; 140.31722 Sea of Japan The Sea of Japan ( see below for other names)

3321-413: The dominant name is a point of contention. South Korea wants the name "East Sea" to be used, either instead of or in addition to "Sea of Japan;" while North Korea prefers the name "East Sea of Korea". The primary issue in the dispute revolves around a disagreement about when the name "Sea of Japan" became the international standard. Japan claims the term has been the international standard since at least

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3402-560: The early 19th century, Which is before Korea was under Japnese rull. while the Koreas claim that the term "Sea of Japan" arose later while Korea was under Japanese rule , and before that occupation, "Sea of Korea" was most widely used internationaly. In 2012, the International Hydrographic Organization (IHO), the intergovernmental organization that maintains a publication listing the limits of ocean and sea areas around

3483-510: The early dawn. A Nippon Oil oil refinery in the Tsuchizaki area was targeted. During the post-war period, the 16th National Sports Festival of Japan was held in Akita in 1961. During the tsunami following the 1983 Sea of Japan earthquake , three Akita residents were killed. On 1 April 1997, Akita was designated as a core city with increased autonomy. The Akita Shinkansen began operations

3564-815: The eastern and southern areas. The oxygen concentration is 95% of the saturation point near the surface; it decreases with the depth to about 70% at 3,000 m (9,800 ft). The high concentration of dissolved oxygen results in the rich aquatic life of the Sea of Japan – there are more than 800 species of aquatic plants and more than 3,500 animal species, including more than 900 species of crustaceans, about 1,000 of fish and 26 of mammals. The coastal areas contain several kg/m of biomass. Pelagic (oceanic) fishes include saury , mackerel, Jack mackerels , sardines, anchovies, herring, sea bream , squid and various species of salmon and trout. The demersal (sea-bottom) fishes include cod , pollock and Atka mackerel . Mammals are represented by seals and whales (ancient name for

3645-525: The entire sea with the highest levels observed in summer and lowest in winter. Wind may also locally change the water level by 20–25 cm (8–10 in); for example, it is higher in summer at the Korean and lower at the Japanese coasts. The sea waters have blue to green-blue color and a transparency of about 10 m (33 ft). They are rich in dissolved oxygen , especially in the western and northern parts, which are colder and have more phytoplankton than

3726-484: The evolutionary process from the analogue to the digital era. The IHO approved the proposal of the new official nautical chart. The new chart will be marked with a numerical identifier without a name. For centuries, the sea had protected Japan from land invasions, particularly by the Mongols. It had long been navigated by Asian and, from the 18th century, by European ships. Russian expeditions of 1733–1743 mapped Sakhalin and

3807-651: The extremity of Esan Saki (41°48′ N). On the Northeast. In La Perouse Strait (Sôya Kaikyô). A line joining Sôni Misaki and Nishi Notoro Misaki (45°55′ N). On the North. From Cape Tuik (51°45′ N) to Cape Sushcheva. The sea currents circulate in the counterclockwise direction. The Kuroshio (Japan Current), the Tsushima Current and the East Korea Warm Current bring warmer and more saline water to

3888-424: The globe in the ship Nadezhda also explored, in passing, the Sea of Japan and the eastern shores of Japanese islands . In 1849, another Russian explorer Gennady Nevelskoy discovered the strait between the continent and Sakhalin and mapped the northern part of the Strait of Tartary. Russian expeditions were made in 1853–1854 and 1886–1889 to measure the surface temperatures and record the tides. They also documented

3969-513: The ice cap advances of the last Ice Age , the exit straits of the Sea of Japan one by one dried and closed. There is controversy as to whether or not in each ice cap advance the world sea level fell low enough for the deepest, the western channel of the Korea Strait , to dry and close, turning the Sea of Japan into a huge cold inland lake with a surface layer of fresh water, freezing over in the winters. The sea climate has warm waters and monsoons. This combination results in strong evaporation, which

4050-624: The limits of the "Japan Sea" as follows: On the Southwest. The Northeastern limit of the Eastern China Sea [From Nomo Saki (32°35′ N) in Kyusyu to the South point of Hukae Sima ( Goto Retto ) and on through this island to Ose Saki (Cape Goto) and to Hunan Kan, the South point of Saisyu To (Quelpart), through this island to its Western extreme and thence along the parallel of 33°17′ North to

4131-604: The main event is held during the evening and night hours, between the 3rd and 6 August each year. During the festival, Kanto stunt events are held in Senshu Park during daylight hours involving many amateur participants. This event was first held in 1931 and every subsequent year, except between 1935 and 1946 and in 1953 and 1965. Overseas exhibitions of the festival were performed in Hamburg , Germany, in 1988, Honolulu , Hawaii , in 2002, London , UK, in 2004, and as an opening event at

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4212-981: The main industries. Akita is also home to two regional banks that serve Akita prefecture and the greater Tōhoku region: Akita Bank and Hokuto Bank . The Akita Thermal Power Station is located in the city. Akita has 44 city and one national elementary schools, 22 city, one prefectural, one national and one private middle schools, and one combined city middle/high school. There are eight prefectural, one city and seven private high schools, as well as four prefectural and one national special education school. [REDACTED] East Japan Railway Company - Ōu Main Line [REDACTED] East Japan Railway Company - Uetsu Main Line [REDACTED] East Japan Railway Company - Oga Line This representative summer festival began 350 years ago, with similar to tanabata festivals held elsewhere in Japan. During this festival, participants balance 15 meter poles with 230 lanterns on their chins;

4293-841: The mainland] and the Western limit of the Inland Sea [defined circuitously as "The Southeastern limit of the Japan Sea"]. On the Southeast. In Simonoseki Kaikyo . A line running from Nagoya Saki (130°49′,5 E) in Kyûsyû through the islands of Uma Sima and Muture Sima (33°58′,5 N) to Murasaki Hana (34°01′ N) in Honsyû . On the East. In the Tsugaru Kaikô . From the extremity of Siriya Saki (141°28′ E) to

4374-422: The nearby Kurokawa Oil Fields in 1914, and a branch of the Bank of Japan opening in Akita in 1917. In 1935, Nippon Kogyo (the forerunner of Jomo ) began development of the nearby Yabase Oil Fields. Akita Bank was established in 1941. War devastated the city on 14 August 1945. During the Tsuchizaki air raid , over 250 people were killed when 134 USAAF B-29 Superfortress , attacked the city from midnight to

4455-486: The north and the Tsushima Basin (Ulleung Basin) in the south-west. The Japan Basin is of oceanic origin and is the deepest part of the sea, whereas the Tsushima Basin is the shallowest with the depths below 2,300 m (7,500 ft). On the eastern shores, the continental shelves of the sea are wide, but on the western shores, particularly along the Korean coast, they are narrow, averaging about 30 km (19 mi). There are three distinct continental shelves in

4536-432: The north. There they merge into the Tsugaru Current and flow into the Pacific Ocean through the Tsugaru Strait. They also feed the Sōya Current and exit through the La Perouse Strait to the Sea of Okhotsk. The returning branch is composed of the Liman, North Korea and Central (or Mid-) Japan Sea currents which bring fresh and cold water along the Asian coast to the south. Water temperature is mostly affected by exchange with

4617-425: The northern part (above 44° N). They form a staircase-like structure with the steps slightly inclined southwards and submerged to the depths of 900–1,400 (3,000–4,600), 1,700–2,000 (5,600–6,600) and 2,300–2,600 m (7,500–8,500 ft). The last step sharply drops to the depths of about 3,500 m (11,500 ft) toward the central (deepest) part of the sea. The bottom of this part is relatively flat, but has

4698-415: The northern part of Japan and Sakhalin Island. The intensity of shipments across the sea is moderate, owing to the cold relations between many bordering countries. As a result, the largest Japanese ports are on the Pacific coast, and the significant ports on the Sea of Japan are Niigata , Tsuruta and Maizuru . Major South Korean ports are Busan , Ulsan , and Pohang situated on the south-eastern coast of

4779-436: The northern part of the sea in winter and is brought south by the sea currents; it is rather stable and is observed all through the year. The hydrological isolation of the Sea of Japan also results in slightly lower average water salinity (34.09‰, where ‰ means parts per thousand) compared with the Pacific Ocean. In winter, the highest salinity at 34.5‰ is observed in the south where evaporation dominates over precipitation. It

4860-444: The northern seas, its production is processed and partly distributed in the Vladivostok area. Vladivostok is also a terminal point of the Trans-Siberian Railway which brings many goods to and from this major port . There is a regular ferry service across the Strait of Tartary between the Russian continental port of Vanino and Kholmsk in Sakhalin. The sea has magnetite sands as well as natural gas and petroleum fields near

4941-437: The open ocean. The sea has no large islands, bays or capes. Its water balance is mostly determined by the inflow and outflow through the straits connecting it to the neighboring seas and the Pacific Ocean. Few rivers discharge into the sea and their total contribution to the water exchange is within 1%. The seawater has an elevated concentration of dissolved oxygen that results in high biological productivity. Therefore, fishing

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5022-440: The order of 100 meters or less. This hinders water exchange, thereby isolating the water and aquatic life of the Sea of Japan from the neighboring seas and oceans. The sea has a surface area of about 1,050,000 km (410,000 sq mi), a mean depth of 1,752 m (5,748 ft) and a maximum depth of 4,568 m (14,987 ft). It has a carrot-like shape, with the major axis extending from south-west to north-east and

5103-412: The peak years of 1848 and 1849 a total of over 170 vessels (over 60 in 1848, and over 110 in 1849) cruised in the Sea of Japan, with significantly lesser numbers in following years. The Sea of Japan was landlocked when the land bridge of East Asia existed. The Japan Arc started to form in the Early Miocene . In the Early Miocene the Japan Sea started to open, and the northern and southern parts of

5184-413: The province. Both clans sided with Tokugawa Ieyasu at the Battle of Sekigahara , and were thus secured in their holdings at the start of the Tokugawa shogunate . During the early Edo period , both the Mogami and the Akita were dispossessed, and their territories broken up into smaller domains , the largest of which were held by the Sakai clan and Uesugi clans . During the Bakumatsu period , all of

5265-557: The same year. In August 2001, the World Games were held in Akita, with the opening ceremony held in the Yabase Track and Field Stadium . In 2004, the city celebrated its 400th anniversary and its beginnings as Kubota Castle town. On 11 January 2005, the towns of Kawabe and Yūwa (both from Kawabe District ) were merged into Akita. Kawabe District was dissolved as a result of this merger. The location of Akita City Hall did not change, and former Kawabe and Yūwa Town Halls are used as civic centers. The 62nd National Sports Festival of Japan

5346-403: The sea are of oceanic origin. Seabed down to 300 m (980 ft) is of continental nature and is covered with a mixture of mud, sand, gravel and fragments of rock. The depths between 300 and 800 m (980 and 2,620 ft) are covered in hemipelagic sediments (i.e., of semi-oceanic origin); these sediments are composed of blue mud rich in organic matter. Pelagic sediments of red mud dominate

5427-421: The sea may host an incipient subduction zone responsible for large earthquakes in 1940 , 1964 , 1983 and 1993 . Nowadays the Sea of Japan is bounded by the Russian mainland and Sakhalin island to the north, the Korean Peninsula to the west, and the Japanese islands of Hokkaidō , Honshū and Kyūshū to the east and south. It is connected to other seas by five straits : the Strait of Tartary between

5508-485: The sea through the Korea Strait and discharges through the Tsugaru (64% or 34,610 km  [8,300 cu mi], La Pérouse 10,380 km  [2,490 cu mi]) and Korea straits. Rainfall, evaporation and riverine inflow make only 1% of the water balance. Between October and April, the outflow exceeds the inflow due to the lower income through the Korea Strait; this balance reverses between May and September. The sea has complex tides , which are induced by

5589-492: The sea. In addition, the monsoon enhances the surface water convection, down to the depths of 30 m (98 ft). The coldest months are January and February, with an average air temperature of −20 °C (−4 °F) in the north and 5 °C (41 °F) in the south. The northern one-quarter of the sea, particularly the Siberian coast and the Strait of Tartary, freezes for about 4−5 months. The timing and extent of freezing vary from year to year, so ice may start forming in

5670-399: The southern tip of Korean Peninsula and to 0.5 m (1.6 ft) at the North Korean shores. Similar low tides are observed in Hokkaidō, Honshū and south Sakhalin. The amplitude however increases to 2.3–2.8 m (7.5–9.2 ft) toward the north of the Strait of Tartary due to its funnel-like shape. Apart from tides, the water level also displays seasonal, monsoon-related variations across

5751-404: The sun and tropical monsoons increases the depth gradient in spring–summer. In the north the surface layer (down to 15 m or 49 ft) may heat up to 18–20 °C (64–68 °F). The temperature would drop sharply to 4 °C (39 °F) at 50 m (160 ft), then slowly decrease to 1 °C (34 °F) at 250 m (820 ft) and remain so down to the seabed. On the contrary,

5832-427: The temperature in the south could gradually decrease to 6 °C (43 °F) at 200 m (660 ft), then to 2 °C (36 °F) at 260 m (850 ft) and to 0.04–0.14 °C (32.07–32.25 °F) at 1,000–1,500 m (3,300–4,900 ft), but then it would rise to about 0.3 °C (32.5 °F) near the bottom. This cold layer at about 1,000 m (3,300 ft) is formed by sinking of cold water in

5913-417: The temperature is almost constant with the depth in the northern part of the sea. However, in central-southern parts, it may be 8–10 °C (46–50 °F) down to 100–150 m (330–490 ft), 2–4 °C (36–39 °F) at 200–250 m (660–820 ft), 1.0–1.5 °C (33.8–34.7 °F) at 400–500 m (1,300–1,600 ft) and then remain at about 0 °C (32 °F) until the bottom. Heating by

5994-457: The tidal wave of the Pacific Ocean penetrating through the Korea Strait and Tsugaru strait. The tides are semi-diurnal (rise twice a day) in the Korea Strait and in the northern part of the Strait of Tartary. They are diurnal at the eastern shore of Korea, Russian Far East and the Japanese islands of Honshū and Hokkaidō. Mixed tides occur in Peter the Great Gulf and Korea strait. The tidal waves have

6075-411: The wind over a small (isolated) and tall obstacle, and usually forms over small mountainous islands. The Sea of Japan meets these conditions as it has frequent winds and cloudy skies, as well as compact, tall islands such as Rishiri (1,721 m or 5,646 ft), Ulleungdo (984 m or 3,228 ft) and Ōshima (732 m or 2,402 ft). The International Hydrographic Organization defines

6156-515: The world, abandoned its most recent of several attempts in the last 25 years to revise its publication of the sea's name. This was primarily because of the lack of agreement between the Koreas and Japan over the naming issue. In September 2020, the IHO announced that it would adopt a new numerical system, also known as "S-130". In November 2020, S-23, the previous version of the nautical chart made in 1953 will be made public as an IHO publication to demonstrate

6237-411: Was established in 1871, and Shima Yoshitake was named the first governor. Ancient Akita District was divided into Kitaakita and Minamiakita Districts in 1878. Most of Akita town burned down in a great fire on 30 April 1886. With the establishment of the modern municipalities system on 1 April 1889, the city of Akita was officially established, including former Kubota and Akita towns. The port area

6318-418: Was held in Akita in 2007. The city of Akita is located in the coastal plains of central Akita Prefecture, bordered by the Sea of Japan to the west. The Omono River runs through the center of the city. Censuses have been conducted in Akita since as early as 1873. Per Japanese census data since 1950, the population of Akita peaked in around the year 2000 and has been in decline since then. Akita belongs to

6399-561: Was originally pronounced "Idewa". The Ichinomiya of Dewa Province was the Chōkaisan Ōmonoimi Shrine in what is now Yuza, Yamagata . During the Heian period , in 878, a major rebellion known as the Gangyo Disturbance ( 元慶の乱 , Gangyo no ran ) erupted in the region against Yamato rule. Another major uprising occurred in 939, as part of East Japan war Tengyō no Ran . Towards the end of

6480-594: Was ruled by a succession of local samurai clans in the Sengoku period , before coming under the control of the Satake clan of Kubota Domain during the Edo period . Under the Tokugawa shogunate , a castle town developed around Kubota Castle . With the start of the Meiji period , Kubota Domain was abolished, and its castle town divided into the towns of Akita and Kubota. Akita Prefecture

6561-610: Was separated into Tsuchizaki-Minato Town , which became part of Minamiakita District. The first city hall was located inside the former Minamiakita District office. In September 1898, the Imperial Japanese Army 's 17th Infantry Regiment was based in Akita. The first public library was opened in 1898, electrification of Tsuchizaki began in 1901, and Akita Station was opened in 1902, as well as running water and telephone services in 1907. The Taishō period brought further development to Akita with Nippon Oil Corporation developing

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